From fee733b45f5571e95e14441a8cac7142f5605cd4 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Thu, 19 Oct 1995 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1995-10-19

---
 pc/ether509.c | 19 +++++++++++++++++--
 pc/ether589.c |  4 ++--
 pc/main.c     | 19 +++++++++++++------
 3 files changed, 32 insertions(+), 10 deletions(-)

diff --git a/pc/ether509.c b/pc/ether509.c
index 94dba6aaf5e48118386d390a294b525b998589d1..81b1b65787840f1352caa8ee71089d094b2bdd1b 100644
--- a/pc/ether509.c
+++ b/pc/ether509.c
@@ -607,6 +607,21 @@ tcm590(Ether *ether)
 	return 0;
 }
 
+static ulong
+tcm589(ISAConf *isa)
+{
+	if(strcmp(isa->type, "3C589") != 0)
+		return 0;
+
+	/*
+	 *  The 3com manual register description says that this a noop for
+	 *  PCMCIA but the flow chart at the end shows it.
+	 */
+	COMMAND(isa->port, SelectWindow, 0);
+	outs(isa->port+ConfigControl, Ena);
+	return isa->port;
+}
+
 /*
  * Get configuration parameters.
  */
@@ -639,8 +654,8 @@ ether509reset(Ether *ether)
 			break;
 		}
 	}
-	if(strcmp(ether->type, "3C589") == 0)
-		port = ether->port;
+	if(port == 0)
+		port = tcm589(ether);
 	if(port == 0 && (pcicfg = tcm590(ether)))
 		port = pcicfg->baseaddr[0] & ~0x01;
 	if(port == 0)
diff --git a/pc/ether589.c b/pc/ether589.c
index 59f20626a888c0fd6c016f5db60bbab453a47e8b..6e2b7127cd002d7ff7b88a31d8cfa47d70eea57f 100644
--- a/pc/ether589.c
+++ b/pc/ether589.c
@@ -53,11 +53,11 @@ configASIC(Ether *ether, int port, int xcvr)
 	/* ROM size & base - must be set before we can access ROM */
 	/* transceiver type is 2 for 'figure it out'  */
 	x = ins(port + AddressConfig);
-	outs(port + AddressConfig, (x & 0x20) | xcvr);
+	outs(port + AddressConfig, (x & 0xf0) | xcvr);
 
 	/* IRQ must be 3 on 3C589 */
 	x = ins(port + ResourceConfig);
-	outs(port + ResourceConfig, 0x3f00 | (x&0xfff));
+	outs(port + ResourceConfig, 0x3f00 | (x&0xff));
 
 	/* move product ID to register */
 	while(ins(port+EEPROMcmd) & 0x8000)
diff --git a/pc/main.c b/pc/main.c
index f1c259a2697178a6e4721054e6cfe0129b533ab9..07fe67cd1918bdf1e3d8f741f4fc58611b0d4a5b 100644
--- a/pc/main.c
+++ b/pc/main.c
@@ -330,17 +330,24 @@ romscan(void)
 		p[0] = 0x55;
 		p[1] = 0xAA;
 		p[2] = 4;
-		if(p[0] != 0x55 || p[1] != 0xAA){
-			putisa(PADDR(p), 2048);
-			p += 2048;
+		if(p[0] == 0x55 && p[1] == 0xAA){
+			p += p[2]*512;
 			continue;
 		}
-		p += p[2]*512;
+		p[0] = 0xff;
+		p[2048-1] = 0xff;
+		if(p[0] == 0xff && p[2048-1] == 0xff)
+			putisa(PADDR(p), 2048);
+		p += 2048;
 	}
 
 	p = (uchar*)(KZERO+0xE0000);
-	if(p[0] != 0x55 || p[1] != 0xAA)
-		putisa(PADDR(p), 64*1024);
+	if(p[0] != 0x55 || p[1] != 0xAA){
+		p[0] = 0xff;
+		p[64*1024-1] = 0xff;
+		if(p[0] == 0xff && p[64*1024-1] == 0xff)
+			putisa(PADDR(p), 64*1024);
+	}
 }
 
 void